package com.atguigu.springcloud.controller;

import com.atguigu.springcloud.entities.CommentResult;
import com.atguigu.springcloud.entities.Payment;
import com.atguigu.springcloud.lb.LoadBalancer;
import lombok.extern.slf4j.Slf4j;
import org.springframework.cloud.client.ServiceInstance;
import org.springframework.cloud.client.discovery.DiscoveryClient;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;

import javax.annotation.Resource;
import java.net.URI;
import java.util.List;

@RestController
@Slf4j
public class OrderController {
//    private static final String PAYMENT_URL="http://localhost:8001";
    // 通过在eureka上注册过的微服务名称调用
    private static final String PAYMENT_URL="http://CLOUD-PAYMENT-SERVICE";
    @Resource
    private RestTemplate restTemplate;

    @Resource
    private LoadBalancer loadBalancer;

    @Resource
    private DiscoveryClient discoveryClient;

    @GetMapping("/consumer/payment/create")
    public CommentResult<Payment> create(Payment payment){
        return  restTemplate.postForObject(PAYMENT_URL+"/payment/create",payment,CommentResult.class);
    }

    @GetMapping("/consumer/payment/get/{id}")
    public CommentResult getPayment(@PathVariable("id") Long id){
        //返回对象为响应体中数据转化成的对象(commentResult对象)，基本上可以理解为Json
        return restTemplate.getForObject(PAYMENT_URL+"/payment/get/"+id,CommentResult.class);
    }

    @GetMapping(value = "/consumer/payment/getForEntity/{id}")
    public CommentResult getForEntity(@PathVariable("id") Long id){
        ResponseEntity<CommentResult> entity = restTemplate.getForEntity(PAYMENT_URL + "/payment/get/" + id, CommentResult.class);
        if (entity.getStatusCode().is2xxSuccessful()){
            log.info(entity.getHeaders()+"\t"+entity.getStatusCode()+"\t"+entity.getBody());
            /*
            headers:   Content-Type:"application/json", Transfer-Encoding:"chunked", Date:"Thu, 07 Oct 2021 03:00:21 GMT", Keep-Alive:"timeout=60", Connection:"keep-alive"]
            statusCode:200 OK
            body: CommentResult(code=200, message=查询数据成功 serverPort: 8002, data={id=31, serial=atguigu001}
             */
            return entity.getBody();
        }else {
            return new CommentResult(444,"操作失败");
        }
    }

    @GetMapping(value = "/consumer/payment/lb")
    public String getPaymentLB(){
        List<ServiceInstance> instances = discoveryClient.getInstances("CLOUD-PAYMENT-SERVICE");
        if (instances==null || instances.size()<=0){
            return null;
        }
        ServiceInstance instance = loadBalancer.instance(instances);
        URI uri = instance.getUri();
        log.info("url[{}]:",uri);
        return restTemplate.getForObject(uri+"/payment/lb",String.class);
    }

    // ====================> zipkin+sleuth
    @GetMapping("/consumer/payment/zipkin")
    public String paymentZipkin()
    {
        String result = restTemplate.getForObject("http://localhost:8001"+"/payment/zipkin/", String.class);
        return result;
    }


}
